Blisters When You Walk Higher Miles. Walking 10 miles (over 3 hours), even if you are used to walking for six miles, is more of a challenge. You can do it, but most people are likely to develop blisters in new places. Shoes and gear that worked fine for two hours may not be ideal for four hours.
How the Aurora Borealis occur. The Northern Lights are caused by the interaction of the solar wind - a stream of charged particles escaping the Sun - and our planet's magnetic field and atmosphere.
Story Highlights. 1  The northern lights may be visible in parts of the USA. 2  They'll be caused by a giant cloud of solar particles, which erupted from the sun. 3  Also called the aurora borealis, the spectacle appears as shimmering lines and waves of light.